I. Based on detection technology and cooling methods, they can be categorized into three types:

Single-element optomechanical scanning type

One of the early product types; it features a simple structure, utilizes single-element infrared detection technology and liquid nitrogen cooling, and is widely used in the medical field.

Electrically cooled infrared thermal imager

Widely used in military applications; these units are noisy, prone to wear and tear, and have a relatively short service life. Because they employ focal plane infrared detection technology and Stirling-cycle internal cooling, the cooling unit is susceptible to damage, resulting in higher costs.

Uncooled focal plane array type

Based on advanced technological designs, this type offers numerous advantages, such as high scanning speeds, silent operation, compact size, portability, and the capability for long-term continuous operation.

II. Classification based on scanning systems: optomechanical scanning imaging systems and non-scanning imaging systems.

1. Detectors for optomechanical scanning imaging systems primarily utilize photovoltaic infrared or single/multi-element photoconductive technologies, each with its own advantages; however, the relatively slow frame response limits the overall speed of the detector.

2. Non-scanning thermal imagers represent a newer class of imaging instruments—specifically, the focal plane array "staring" imaging devices introduced in recent years. They offer superior functionality compared to other thermal imagers. Their detectors are based on monolithic integrated circuits capable of focusing on the entire target object. They are portable and produce clear images, while offering features such as autofocus, continuous zoom, image freezing, spot/line/isothermal temperature measurement, and voice annotation. Additionally, they support PC cards for high-capacity storage of up to 500 images. This type of thermal imager is likely to become the mainstream product in the future market.

Having understood the classification of infrared thermal imagers, let us now explore their technical specifications with Juge Electronics to ensure you are well-prepared to use these devices proficiently:

1. Operating waveband: The spectral response range, typically 3–5 μm or 8–12 μm.

2. Detector type: Refers to the specific infrared component used for detection. It employs single-element or multi-element (e.g., 8, 10, 16, 23, 48, 55, 60, 120, or 180 elements) photoconductive or photovoltaic infrared detectors. Materials used include lead sulfide (PbS), lead selenide (PbSe), indium antimonide (InSb), mercury cadmium telluride (HgCdTe), lead tin telluride (PbSnTe), doped germanium (Ge:X), and doped silicon (Si:X).

3. Scanning format: PAL format (the standard television format in China).

4. Display mode: Monochrome or pseudo-color display.

5. Temperature measurement range: The range between the minimum and maximum temperature values to be measured.

6. Temperature measurement accuracy: The maximum temperature measurement error of the infrared thermal imager expressed as a percentage of its measurement range.